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From:	"Henrik Bengtsson" <hb AT maths DOT lth DOT se>
To:	<cygwin AT cygwin DOT com>
Subject:	gcc and libtiff, maybe a newbie question
Date:	Fri, 3 Jan 2003 17:41:50 +1100
Message-ID:	<000201c2b2f3$3337fee0$7341a8c0@alpha.wehi.edu.au>
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Hi, first I haven't done C programming in years and am a bit rusty with
gcc and ld. I am having problems with ld reporting "undefined reference
to _TIFFOpen" etc, which should be in libtiff. However, I am not even
sure if the problem is about libtiff or if miss something else.

Here is my minimize code I am trying to compile and link (write.c):

#include <stdio.h>
#include "tiff.h"
#include "tiffio.h"

int main(int argc, char *argv[]) {
  TIFF *image;

  if((image = TIFFOpen("output.tif", "w")) == NULL){
    printf("Could not open output.tif for writing\n");
    exit(42);
  }
  TIFFClose(image);
}

I get the following error:
% gcc -static -lm -ltiff -o write.o -ltiff write.c
/tmp/ccfugoHj.o(.text+0x76):write.c: undefined reference to `_TIFFOpen'
/tmp/ccfugoHj.o(.text+0xa2):write.c: undefined reference to `_TIFFClose'
collect2: ld returned 1 exit status

According to the following troubleshooting it looks like it finds
libtiff.a (or something):
% gcc -static -lm -ltiffX -o write.o -ltiff write.c
/usr/lib/gcc-lib/i686-pc-cygwin/3.2/../../../../i686-pc-cygwin/bin/ld:
cannot fi
nd -ltiffX
collect2: ld returned 1 exit status

According to Cygwin Setup the tiff version is 3.5.7-1. gcc is v3.2
(20020927). 

% ls -l /usr/lib/libtiff.*
-rwx------+   1 hb       None       316100 Feb 10  2002
/usr/lib/libtiff.a
-rwx------+   1 hb       None       152620 Feb 10  2002
/usr/lib/libtiff.dll.a

% ls -l /usr/include/tiff*
-rwx------+   1 hb       None        24302 Feb 10  2002
/usr/include/tiff.h
-rwx------+   1 hb       None         5254 Feb 10  2002
/usr/include/tiffconf.h
-rwx------+   1 hb       None        14072 Feb 10  2002
/usr/include/tiffio.h
-rwx------+   1 hb       None        11554 Feb 10  2002
/usr/include/tiffiop.h
-rwx------+   1 hb       None          410 Feb 10  2002
/usr/include/tiffvers.h

I appreciate any help. 

Cheers

Henrik Bengtsson



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